73 lines
4.5 KiB
HTML
73 lines
4.5 KiB
HTML
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<meta name="DC.Title" content="Floating-point constants" />
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<meta name="abstract" content="A floating-point constant is a representation of a numerical constant, shown as an optional sign followed by one or more digits and a decimal point, which may be at the end." />
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<meta name="description" content="A floating-point constant is a representation of a numerical constant, shown as an optional sign followed by one or more digits and a decimal point, which may be at the end." />
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<title>Floating-point constants</title>
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</head>
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<body id="rbam6fltpntcon"><a name="rbam6fltpntcon"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Floating-point constants</h1>
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<div><p>A floating-point constant is a representation of a numerical constant,
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shown as an optional sign followed by one or more digits and a decimal point,
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which may be at the end. </p>
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<div class="section"><p>This representation consists of:</p>
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<ul><li>A significand sign: The significand sign may be + or -. The significand
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sign is optional; it is assumed to be + if no sign is specified.</li>
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<li>A significand: The significand must contain a decimal point. The maximum
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number of digits that can be specified for the significand is 253; however,
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only the first 17 significant digits are used.</li>
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<li>An exponent character: The exponent character must be E.</li>
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<li>An exponent sign: The exponent sign must be + or -. The significand sign
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is optional; it is assumed to be + if no sign is specified.</li>
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<li>An exponent: The exponent must be an integer; numbers 0 through 9 are
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valid. The maximum number of digits that can be specified is three.</li>
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</ul>
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<p>All floating-point constants are stored as double-precision values.
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No blanks are allowed between any of the parts of a floating-point constant,
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and the parts must be in the order listed above.</p>
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<p>Some commands have
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parameters for which floating-point constants can be specified:</p>
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<ul><li> <span class="cmdname">Call Program (CALL)</span> or <span class="cmdname">Call Procedure (CALLPRC)</span> command:
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You can use the PARM parameter to pass a floating-point constant to a called
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program. Any program you call must receive a floating-point constant as a
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double precision value. </li>
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<li><span class="cmdname">Change Program Variable (CHGPGMVAR)</span> command: You can
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use the VALUE parameter to change a floating-point variable in a program.</li>
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<li>Copy File (CPYF) command: You can use floating-point construction in the
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FROMKEY, TOKEY, and INCREL parameters to select which records are copied from
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a database file.</li>
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</ul>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbam6constvalues.htm" title="A constant value is the actual value. The types of constants are character string (includes names, date and hexadecimal values), decimal, and logical.">Constant value</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../rzahg/rzahgdds.htm">DDS</a></div>
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</div>
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</div>
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</body>
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</html>
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